Corrugated tube.



' N0. 686,8l8 Patented Nov. l9, l90l. J. MACPHAIL.

CORRUGATED TUBE.

(Application filed Feb. 17, 1900.)

(No Model.)

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UNTTED STATES PATENT @FFICE.

JAMES MACPIIAIL, OF BLUE ISLAND, ILLINOIS.

CORRUGATED TUBE.

SJPECIFICATION forming part of Letters Patent No. 686,818, dated November 19, 1901. Application filed February 17, 1900. Serial No. 5,662. (No model.)

T0 61/ whom it may concern.-

Be it known that I, JAMES MAOPHAIL, a citizen of the United States, residing at Blue Island, in the county of Cook and State of Illinois, have invented a new and useful Corrugated Tube, of which the following is a specification.

This invention relates to corrugated tubes.

The object of the invention is to produce a corrugated tube of simple construction which is economical in manufacture and strong and durable in use.

The invention consists, substantially,in the construction, combination, location, and relative arrangement, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings, and to the various views and reference-signs appearing thereon, Figure 1 is a view in plan of one portion or section employed in the construction of a corrugated tube in accordance with my invention. Fig. 2 is a transverse section of the same on the line 2 2, Fig. 1, looking in the direction of the arrows. Fig. 3 is a similar view of the cooperating portion or section of the tube. Fig. A is a similar View of the corrugated tube complete, the portions or sections being shown in assembled relation.

The same part is designated by the same reference-sign wherever it occurs.

In carrying out my invention I employ two longitudinally split and corrugated tubes, designated, respectively, by reference-signs A and B. These tubes may be corrugated longitudinally in any suitable or convenient manner. Reference-sign C designates a corrugation in each of these sections or portions A B. The corrugations may be located at any point in the surface of the sections. The cross-sectional area of section B when said section is in its normal detached position is greater than the cross-sectional area of section A. The tube is completed and formed by inserting the section B, of larger area 1ongitudinally, into the section A, which is of smaller area, so that the edges or lips D E of section B will be compressed toward each other and will conform to the corrugation G in section A, while the lips F G of section A.

will be expanded. or separated to conform to and fit in a corrugation O of section B, as clearly shown in Fig. 4. To this end the two sections are assembled in inverted relation, so as to break joints with each other, as clearly shown. A corrugated tube constructed in accordance with the principles above described is exceedingly strong and durable, is simple in construction, and easily and cheaply manufactured and assembled. By making the sectionsA B of metal or other suitable material and inserting the section of larger crosssectional area within the section of smaller cross-sectional area a reactionary pressure between the contracted or collapsed sides of the one and the expanded sides of the other will firmly hold the sections tegether and maintain their union. At the same time the corrugations serve to lock the sections together, while also strengthening the completed article.

If desired and as shown, the sections may be tapered longitudinally.

It is obvious that the sections may be con structed of the desired length for the uses and purposes for which they are adapted and that a more extended length may be secured by joining endwise two or more tubes constructed as above described, the end of one section being telescoped into the proximate end of the next adjacent section.

A tube constructed in accordance with my invention may be employed for shafts, bars, framing, braces, poles, beams, sills, sleepers, or generally for any purpose where such construction may be necessary.

Having now described the object and nature of my invention and a construction embodying the same, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent of the United States, is-

1. As a new article of manufacture, a tube, beam, pipe or the like, composed of longitudinallycorrugated split sections, said sections being telescopically assembled, as and for the purpose set forth.

2. As a new article of manufacture, a tube, beam, pipe or the like, composed of longitudinally-corrugated split sections of differing In witness whereof I have hereunto set my hand, this 10th day of February, 1900, in the 10 presence of the subscribing witnesses.

JAMES MACPHAIL.

Witnesses:

E. O. SEMPLE, S. E. DARBY. 

